Increased stormwater runoff attributable to new development must not exceed the capacity of the downstream drainage systems or adversely affect adjoining property. Where the projected runoff would exceed capacity based on the standards specified in this Code, the City may require the phasing of development, the use of control methods such as retention or detention, and/or the construction of off-site drainage improvements as means of mitigation. New developments or improvements of existing developments should consult the City of Liberty Hill for compliance.